US1632880A - Inlet manifold for internal-combustion engines - Google Patents

Description

June 21 1927 E. R. BURTNTT INLT MANIFOLD FOR INTRNAL COMBUSTION ENGINES Filed July'sl, 1924 N l (f .\.1 m mm1 mls il Patented June 21, 1927.

UNITED STATES reszse PATENT oFFicE.

EVERETT `IR.. BURTETT,'OF LOS ANGELES, CALIFORNIA, ASSGNOR, BY DIRECT AND MESNE ASSIGNMENTS, TO THE AUTOMOTIVE VALVES CO.,- OF LOS ANGELES, CALI- FORNIA, .A VOLUNTARYiTRUST.

INLET MANIFOLD Fon IN'rnnnAncoMBusfrIoN ENGINES.

Application filed .Tuly 31, 1924. Serial No. 729,299.

My invention relates generally to internal combustion engines and more particularlyA lcharge being admitted through Aports uncovered by the piston at suchtime.

lt. has been found by experiment and practice, with an engine embodying two units of the two-stroke cycle principle wherein one revolution, or 360, completes the cycle, and with the admission of the fuel charge tal-:ing place during the time the precompression piston passes over outer dead center, that this function occupies a total time of approximately 909, As there/are only two of these admission periods,it necessarily follows that in an engine of two units, during each 360o shaftf rotation, each complete period of 90 duration, with alternateV and successive 90o non-admission periods between each of the 90' admission periods, causes, where a conventional manifold is used, a very great fluctuation of pressure within said manifold and necessitates the use of a carburetor having too great a volume capacity and a manifold without the necessary restriction to provide sufficient charge velocityV to develop maximum power and fuel economy in engine operation. l

` Therefore, it is an object of my invention, to provide an inlet manifold with anoutlet to each precompression unit and an inlet from the carbureter or mixing means. In order thatthe velocity be as high as pose sible, the passsageways or ducts between the inlet and outlets of the manifold are made comparatively small, so as to provide a volume compatible with the displacement of the precompression chamber in the manifold, so that, during the short period of 90o in which the chamber must fill, I have formed a continuous passage manifold, in which the part joining the two outlets and out of the path of direct circulation between the inlet and outlets is relatively large in cross section.

A further object of my invention is, to form the manifold so that there will be no liquid traps in thefpassageways, the gravity 'drain surfaces extending Veach way from the inlet opening to the manifold, to each outlet opening therefrom, and gravity drain surfaces extending from the center of the non-inlet passage that connects the two outlets in both directions from center to said manifold outlets. y l

lVith the foregoing and other objects in view, my invention consists in the features of construction and combination and ar rangement of parts hereinafter more fully described and claimed,'reference being had to the accompanying drawings, in which yFigure 1 is a top plan view of a gaseous fuel inlet manifold of my improved con-l struction Figure 2 is ay vertical section taken on thel line 2 -2 of Figure l;

Figure 3 is a vertical cross section taken approximately on the line 3-3 of Figure 1; VFigure 4 is a vertical cross section taken approximately on' the line i-li of Figure 1.

My improved inletmanifold is preferably cast in a single piece, and it comprises an upper member 10 and a lower member 11,

which members are hollow so as to provide a: practically continuous chamber.

The central portion of the upper member 10 is relatively large in cross section so to provide a central chamber 12 of consider able area. F rom the housing that surrounds this relativelyA large central chamber, the

walls of member l() gradually decline in opposite directions toward theV ends of the casting, and thus oppositely arranged declining drain surfaces 13 are formed on the bottom walls of the end portions of the housing, which drain surfaces startr from the center of the housing 10 and gradually decline in both directions therefrom. Y

The ends of upper hollow member l unite directly with downwardly and inwardly curved hollow end members 14 and formed integral with the rear portions of the lower ends of these members 14 are rearwardly projecting lugs l that are adapted to be rigidly fixed in any suitable manner directly to the cylinder block of an engine. rFliese lugs 15 are provided with horizontally dis-l l than that of hollow member 10, and throughout-its `length the cross sectional area of said hollow member is less than the cross sectional dimensions of said upper member l0. A flanged opening 17 is formed at the center' of member 11 for the admission of gaseous fuel from a carbureter or like source ofsupply,and from this gaseous fuel inlet the. bottom surfaces of the chamber through `member 11 decline in opposite directions to Vward the gaseous fuel inlet opening 16, there- Vby providing drain surfaces 18 that correspond with the drain surfaces 13 in upper member l0.

Thus it will be seen that I have provided a relatively simple and practical inlet manifold havingan outlet to each precompression unit of the engine and with a single gaseous fuel inlet from the carbureter or ,other source of gaseous fuel supply and which inlet is located at a central point between the outlets,`and, further, that there is a relatively large chamber between the gaseous fuel outlets. As a result of this arrangement, the sudden demand developed by the suction stroke of one of the pistons within the engine onA the gaseous fuel Volunie within the manifold will notv cause an extraordinary orabnormal fluctuation of velocity and pressure on the carbureter, which result is brought about by the large area `within the manifold and the provision of the continuous chamber therein. y As a result, the carbilreter may be restricted so as to provide proper velocity and the desirable and advantageous steady column movement, which latter materially assists in uniform metering of the fuel with the air.

lVhile the engine is in operation there will always be a certain amount of gaseous 4fuel within the ,chamber in the manifold,

and as this chamber is endless and portions thereof extend in two directions from each gaseous fuel outlet port, there will beuvery reter that supplies said manifold with fuelVK will function to `develop maximum power and fuel economy duringengine operation. Inasmuch as the bottom surfaces of both upper andlower members `of the manifold decline in both directions away from the center, any condensation that may take place on the inner surfaces of the walls of the manifold will eventually flow by gravity downwardly over the drain surfaces and will pass, through the out-let port-s `16 to the combustion chambers within the engine.

An inlet manifold 'of my improved con struction is comparatively simple, may be easily and cheaply produced and is very effect-ive in performing its intendedfunctions.

I claim as my invention: y 1. A gaseous fuel inlet manifold comprising a. housing having upper and lower cliambers,.one of which is arranged directly above the other, the ends of which are connected by short vertically disposed curved ducts, the p upper chamber being substanti ally larger in area than the lower chamber, the connected ends of the two chambers being provided with outlet openings, the intermediate portion of the lower chamber being provided with an inlet openingand the bottom surfaces of both chambersbeing formed so as to` provide'gravity drainage from their intermediate portions toward y' both 4of said outlet openings. t

2. A gaseous fuel inletmanifold havingr upper and lower chambers, one of Vwhich `is arranged directly above the other-,the upper chamber being substantially larger than the lower chamber, the ends of said chambers l having t communication with each other `by means'tof short vertically disposed curved ducts, Vthe bottom surface` ,of the upper chamber being formed so `that it gradually declines from `a centralV point towardboth ends,` the ends of the lower chamber being lprovided kwith outlet openings, the central portion/of said lower `chamber being Vprovided with an inlet opening and the bottom surface of which lower chamber gradually declines from the centrally arranged inlet opening toward said outlet. openings. p

Intestimony whereof I affix my signature.

. EVERETT R. BURTNETT.`

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